4.7 Article

Effects of ply thickness and 0°-layer ratio on failure mechanism of open-hole and filled-hole tensile tests of thin-ply composite laminates

Journal

COMPOSITE STRUCTURES
Volume 280, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2021.114926

Keywords

Polymer-matrix composites (PMCs); Strength; Damage observation; Finite element analysis (FEA)

Funding

  1. Japan Science and Technology Agency
  2. Japan Society for the Promotion of Science [20J13151]
  3. Grants-in-Aid for Scientific Research [20J13151] Funding Source: KAKEN

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Thin-ply technology offers more possibilities for composite structures, allowing for variations in ply thickness and laminate layup. This study investigated the effects of ply thickness and 0 degrees-layer ratio on the strength and damage behavior of thin-ply composite laminates, finding that thin-ply can reduce strength and a higher 0 degrees-layer ratio leads to increased strength with a transition to splitting-dominated failure. Additionally, finite element analysis indicated that fastener restraint can alleviate stress concentration, potentially impacting tensile strength.
Thin-ply technology provides increasing possibilities for composite structures, expanding the design space for ply thickness and laminate layup. This study examines the effects of ply thickness and the 0 degrees-layer ratio on the strength and damage behavior of thin-ply composite laminates. We conducted open-hole tensile (OHT) and filled-hole tensile (FHT) tests on laminates with various ply thicknesses and 0 degrees-layer ratios, observing the internal damage via X-ray radiography. It was confirmed that the damage retardation effect of the thin-ply reduced both the OHT and FHT strengths. Furthermore, the results revealed that laminates with a higher 0 degrees-layer ratio have higher strengths and the failure of laminates with a higher 0 degrees-layer ratio transitioned to splitting-dominated failure. Finite element analysis of the fastener restraint indicated that the fastener restraint alleviated the stress concentration in the 0 degrees-layer around the hole, potentially leading to a difference in the OHT and FHT strengths.

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